Former New Jersey governor Chris Christie, Florida governor Ron DeSantis, former U.N. ambassador Nikki Haley & businessman Vivek Ramaswamy attacked each other during the final Republican primary debate before the Iowa caucuses. Former president Donald Trump, who has refused to take part in any of the debates, remains the party's frontrunner.

This episode: political correspondent Sarah McCammon, political reporter Ximena Bustillo, and senior political editor & correspondent Domenico Montanaro.

This episode was edited by Casey Morell. It was produced by Jeongyoon Han. Our executive producer is Muthoni Muturi.

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